Inquiry regarding who is recommended for and the effectiveness of melasma skin boosters

I am writing this post to ask a few questions regarding melasma skin boosters.

An acquaintance recommended this to me, saying their melasma improved, and I became interested because I also have pigmentation around my cheekbones. I am curious to know exactly which skin concerns a melasma skin booster is effective for, and whether it helps with blemishes or improves overall skin tone in addition to melasma.

I would also like to know if there are specific target groups for melasma skin boosters. I want to know if they are effective even for pigmentation that is relatively deep, or if they are better suited for certain skin types. It would also be helpful to know the treatment intervals and recommended number of sessions.

I would appreciate it if those who have experience with melasma skin boosters could provide an answer.